Low Voltage Wiring; External Emergency Stop; External Auto/Stop - Trane RTAD 085 Installation Operation & Maintenance

Low-voltage wiring
The remote devices described below
require low-voltage wiring. All wiring
to and from these remote analog
devices to the UCM-CLD (and A70
for Free cooling/Heat Recovery
units), as described in this
paragraph, must be made with
shielded, twisted-pair conductors. Be
sure to ground the shielding only at
the Clear Language Display.
CAUTION! To prevent control
malfunction, do not run low-voltage
wiring (<30V) in conduits with
conductors carrying more than 30 V.
54
Installation - Electrical

External Emergency stop

(normal trip)
The Clear Language Display
provides auxiliary control for a
customer-specified or -installed
latching tripout. When this remote
contact 6S2 (furnished by the
customer) is provided, the chiller will
run normally when the contact is
closed. When the contact opens, the
unit will trip off on a manually
resettable diagnostic. This condition
requires manual reset at the chiller
switch on the front of the Clear
Language Display. To connect, first
remove the jumper located between
terminal 3 and 4 of A1 TB1. Refer to
the field diagrams that are shipped
with the unit.

External Auto/Stop

If the unit requires the external
Auto/Stop function, the installer
must provide leads from the
remote contacts 6S1 to the proper
terminals of the module A1 (to A70
for Free-cooling units) terminals
TB3-3 and TB3-4 (J8-IDH14 and 6X2-
1 for Free cooling/Heat Recovery
units), in the control panel.
The chiller will run normally when
the contact is closed. When the
contact opens, the compressor(s), if
operating, will go to the
RUN:UNLOAD operating mode and
cycle off. Unit operation will be
inhibited. Re-closure of the contacts
will permit the unit to automatically
return to normal operation. Field-
supplied contacts for all low voltage
connections must be compatible
with dry circuit 24VDC for a 12 mA
resistive load. Refer to the field
diagrams that are shipped with the
unit.
External circuit lockout -
Circuit 1
The UCM provides auxiliary control
of a customer-specified or -installed
contact closure, for individual
operation of circuit number 1. If the
contact is closed, the refrigerant
circuit will not operate. The
refrigerant circuit will run normally
when the contact is opened. External
circuit lockout will only function if
External Circuit Lockout (service
setting Menu) is enabled.
Connections are shown in the field
diagrams that are shipped with the
unit.
External circuit lockout -
Circuit 2
The UCM provides auxiliary control
of a customer-specified or -installed
contact closure, for individual
operation of circuit number 2. If the
contact is closed, the refrigerant
circuit will not operate. The
refrigerant circuit will run normally
when the contact is opened. External
circuit lockout will only function if
External Circuit Lockout (service
setting Menu) is enabled.
Connections are shown in the field
diagrams that are shipped with the
unit.
RTAD-SVX01F-E4